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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((20*x)/3)*x+2/x = 0
20/3*x^2+2*x^-1 = 0
2*x^-1*(10/3*x^3+1) = 0
10/3*x^3 = -1 // : 10/3
x^3 = -3/10
x^3 = -3/10 // ^ 1/3
x = -(3/10)^(1/3)
2/x = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x naleu017Cy do O
x = -(3/10)^(1/3)
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